I make code to draw square by Direct3D 9:

struct CustomVertex { float X, Y, Z, RHW; CE_uint4 Color; } vertices[4] = {
        { 10.0f,         10.0f,         0.0f, 1.0f, D3DCOLOR_ARGB(255, 255, 255, 255)},
        { 10.0f + 20.0f, 10.0f,         0.0f, 1.0f, D3DCOLOR_ARGB(255, 255, 255, 255) },
        { 10.0f,         10.0f + 20.0f, 0.0f, 1.0f, D3DCOLOR_ARGB(255, 255, 255, 255) },
        { 10.0f + 20.0f, 10.0f + 20.0f, 0.0f, 1.0f, D3DCOLOR_ARGB(255, 255, 255, 255) }
    };
    IDirect3DVertexBuffer9* v_buffer = CE_NULL;    // the pointer to the vertex buffer


    // create a vertex buffer interface called v_buffer
    CE_CHECK_HRESULT(renderer.gDevice()->CreateVertexBuffer(4 * sizeof(CustomVertex), 0, (D3DFVF_XYZRHW | D3DFVF_DIFFUSE), D3DPOOL_MANAGED, &v_buffer, CE_NULL));

    void* pVoid;    // a void pointer
    // lock v_buffer and load the vertices into it
    CE_CHECK_HRESULT(v_buffer->Lock(0, 0, &pVoid, 0));
    memcpy(pVoid, vertices, 4 * sizeof(CustomVertex));
    CE_CHECK_HRESULT(v_buffer->Unlock());

    // select which vertex format we are using
    CE_CHECK_HRESULT(renderer.gDevice()->SetFVF((D3DFVF_XYZRHW | D3DFVF_DIFFUSE)));

    // select the vertex buffer to display
    CE_CHECK_HRESULT(renderer.gDevice()->SetStreamSource(0, v_buffer, 0, sizeof(CustomVertex)));

    CE_CHECK_HRESULT(renderer.gDevice()->DrawPrimitive(D3DPT_TRIANGLESTRIP, 0, 2));

    v_buffer->Release();    // close and release the vertex buffer

But is here in this code memory leak, And idk where and how.

NOTE: the code is used in game loop, like this:

while() {

// the code

}

why? Because my project requires this way.

ADDITIONAL NOTE: Idk the code is suitable for this way.